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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811523bb5524ad9d4e9400baed305b3920abecd2a582d583cf3d2868bd8a0642' 
  AND token = 'gqBRkokch54c6+H7dfHetHRgN6O2v6ncACbhLtxLKtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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