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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c7c0c2cc9ab2816fedb092128aa651189b39574597873c95afdb5a5002d262' 
  AND token = 'ebt7jtynx96kaHLHk1rAiE1gZfLOgJANwx/t897cYvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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