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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba058b43bfd29ed516492bd0e16558350091d51408fa2e094623933dd561d7a' 
  AND token = 'cVnfpu6iqxI6YNmaYwZMFE9pbTnZsOAE8vlu1biJe/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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