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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132e51111c02b3b0fd4245ce49b5cfcc363ed9183187a1f4d1c110a2014cae00' 
  AND token = '/BQ3Rr2rc3vgWQ29ifXdfYAcU8bmm161Pbgli4WXv44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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