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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdf859d51ebcf6aca51d64b99dfde5bb1a935fc8a6c1eaef3af901595aede84' 
  AND token = 'i0FUZqv2i/OMDCTnohABqJCtfdMlUJfW3UjfL5i+PS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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