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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b636014d33922ee1ea9143ca27d58e071c2c20459adfd0f36e10bde50ed043f9' 
  AND token = '8J108xmB+cnavHO7mjagmBPfpABMx7BNx8XLdtSJDF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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