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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa388967d29ca3bea0ecb596bd4af6beeea7fcca2d80b79bfb588bb29277697' 
  AND token = 'MWACr3ZSbyX4AX1tsjgWWBPfzlc1SuNUqSOhY3PDe4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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