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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58851d5f6f78707d4910c6c9d4413cb03f0f69301f97901b3f6089a5ef182dc' 
  AND token = 'HcRIKHO7tUcYx7vQ7MxILdANMlQ+Q4ENGapI03X3Jtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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