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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4993fb68b9ce7093de578ad3a724a000aa48df9095952c9e8a2e867e827fd153' 
  AND token = 'mB9CGC1JexXA99JOhZMF4S088OEt1ZYpMPVCGAX7O3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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