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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a271abcc756b2c07a06599749c561770e585e6f8b0e0c6eb7f5e35692cb945' 
  AND token = 'EF7vUmd8a7kFwbbPxpVsLRitBQ8iedix1b3jAbNGKu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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