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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8aa3813ce24ff3e18ffd7f542a534968d168fba3d7aaeb9f4194c461c7241d3' 
  AND token = 'AC7PK1Luv6IqMM7cg957a2w1t7mwsMCKdP4S5V5VXMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}