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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b952b9ca859f07913bebdf5ec43f959976bfd9a489a13d635c6e6e84d1ab672a' 
  AND token = '5wQomjiSASMorRsASpwmLITntFteuPLJQlHKHt6nSEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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