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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23cc974439a63ac0b3a261321f6d0a51514c23c1828e11c6ea5c5a5079cf833' 
  AND token = 'yhiDdWYTNkvSa3LpqUD7z2abQEK1eAM2EL/Z8TtNPgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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