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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c546c34073939538493eb3d44b8225fd72d16133c7787b3a9c3b95feaf96f291' 
  AND token = 'oRCJJOsoMNG9r1Qe34NM7g6skL9C9pLleLgoUJkOk5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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