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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90aacb451190f556f9b1723fd4a0c1da043e2978ac842204d0a2eececa6a711' 
  AND token = '7XwC823CvcezrIaWG1H8wvL+CzLdpeQ3+jmCy+hGllI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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