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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd51d890460e0f90ffcb159cd2e4195c0b01ff7a3ab37b0417d2d7e4a3a8cb3' 
  AND token = 'DTqReKuFHctzIyoe1drcwq2vP16mGSzKqr5a7fWy5n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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