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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95098f3a05dd1dabd599b33b3b05cba04a61ab9f23440d403df8949cdfe6bd4' 
  AND token = '+wke7JJLBYhr1u7cmHhkZFmOFy9w06vljAmxRUV8ynA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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